Tejun Heo wrote:
JMicron AHCI controllers set PORT_IRQ_IF_ERR on device errors. The IRQ status bit indicates interface error or protocol mismatch and ahci driver interprets it into AC_ERR_ATA_BUS. So, whenever an ATAPI device raises check condition, ahci interprets it as ATA bus error and thus resets it which, in turn, raises check condition thus creating a reset loop and rendering the device unuseable. This patch makes JMB controllers ignore PORT_IRQ_IF_ERR when interpreting error condition. Signed-off-by: Tejun Heo <htejun@xxxxxxxxx> Cc: Justin Tsai <justin@xxxxxxxxxxx>
ACK, but please resend against latest #upstream-fixes (which includes Intel ahci ICH9 PCI IDs)
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